Transgenic Animals

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Transgenic Animals IQP – 43 - DSA - 3001 IQP – 43 - DSA - 1845 IQP – 43 - DSA - 6882 IQP – 43 - DSA - 0994 TRANSGENIC ANIMALS An Interactive Qualifying Project Report Submitted to the Faculty of WORCESTER POLYTECHNIC INSTITUTE In partial fulfillment of the requirement for the Degree of Bachelor of Science By: _______________ _______________ _______________ _______________ Marcella Corcoran Nicholas Maloney Whitney Moore Sara Munro August 25, 2004 APPROVED: ______________________ Prof. David S. Adams, Ph.D. Project Advisor 1 ABSTRACT Transgenic animals are animals that have been genetically altered by inserting a transgene into their genomes to express a new trait. This IQP provides an overview of the construction of transgenic animals, the categories they fall into, and notable examples of each type. The effects of this new technology on both science and society were investigated by describing current ethical and legal debates. Finally, conclusions were formulated based on our research. 2 TABLE OF CONTENTS Page Signature Page…………………………………………………………………………………..1 Abstract………………………………………………………………………………………… 2 Table of Contents………………………………………………………………………………..3 Executive Summary……………………………………………………………………………..4 Project Objective………………………………………………………………………………...7 Chapter 1: Transgenic Animal Description and Construction…………………………………..8 Chapter 2: Transgenic Animal Classification and Examples…………………………………..18 Chapter 3: Transgenic Ethics…………………………………………………………………...37 Chapter 4: Transgenic Legalities……………………………………………………………….57 Chapter 5: Conclusions…………………………………………………………………………67 Bibliography……………………………………………………………………………………70 3 EXECUTIVE SUMMARY Transgenic animals are animals that have had their DNA genetically transformed to express or mimic a useful feature that is not normally expressed in that species. Scientists have a wide variety of reasons for wanting to create genetically altered animals that not only affect science but also society. There are five main categories of transgenic animals. The first category, disease models, includes animals such as Alzheimer’s mouse, AIDS Mouse, and OncoMouse™ that are engineered to mimic some aspect of a human disease. These animals provide models for investigating disease mechanisms and potential cures. The second category, transpharmers, includes animals engineered to express protein drugs or antibiotics in their milk. These animals provide a convenient source for new medications with no animal sacrifice. This category includes such models as Baby Herman (the world’s first transgenic cow, whose female offspring provide the first successful bovine transpharmer) and the Genzyme goats. These animals provide new sources for drugs we normally synthetically produce. The third category is the xenotransplanters that are engineered to produce organs compatible with humans. The fourth category is transgenic food sources, that include animals like Superpig and Superfish that are engineered to be larger than normal. The last group of transgenics include the scientific models that teach us something new about a specific protein’s function in vivo. Each group contains animals that have brought both positives as well as negatives to science and society. The main question surrounding transgenic animals is that now that we have the knowledge and technology to create these animals, should we? As is typical of any new powerful technology, its affects on society are far reaching. The creation of transgenic animals raises many ethical debates. While some see the technology negatively as tampering with life and trying to play God, others are very optimistic and see these animals as extremely beneficial 4 to human life. Many religions and animal rights activists frown upon genetically altering an animal, even in those cases where it is for the good of the human race. These groups show concerns with the creation, maintenance, usage, and suffering of these animals. For example, with the OncoMouse™, the mouse is induced with cancer, but its suffering provided huge advancements for the treatment and diagnosis of cancer in humans. On the other hand, in the case of the Superpig, the animal suffered greatly and was sacrificed; its original purpose was for healthier meat. Ethically, these two animals pose different views even though each animal has a transgenic alteration and both animals suffered. The OncoMouse™ suffered for a good cause and advanced the medical community, and the Superpig suffered as an unsuccessful food source, making the OncoMouse™ a more positive experiment. These two examples demonstrate why ethics must be determined by keeping the purpose and success in mind. Following the research performed for this IQP, we authors feel that each transgenic category serves a unique purpose, and therefore the ethics surrounding these animals must be considered on a case by case basis. We believe that in those specific cases where there is strong documented medical benefit, with little or no animal suffering, transgenic technology should be supported, but not in those cases with no clearly documented medical benefit. Transgenic technology also has legal ramifications. Harvard and Dupont’s OncoMouse™ is the world’s first patented animal, having received patents in the U.S. and several European countries. However, not all countries agree that animals can be patented; the OncoMouse™ patent case has recently been rejected in Canada. Although the Canadian case involved many appeals, it was eventually the decision of the courts that the oncomouse is not an invention, but an unpatentable higher life form. In the U.S., the case raised so many key issues that amendments were issued to the U.S. law to oversee and govern the creation, usage, and treatment 5 of transgenic animals. Presently, the United States patent laws allow the patenting of animals as long as the new creation remains “non-obvious” compared with former creations. “A definition of what is non-obvious in the eyes of the court has been explained to include something that a hypothetical worker of the relevant field, devoid whatsoever of any imagination and inventive capacity, though infinitely knowledgeable of and versed in the prior art and the common knowledge of the relevant field, could never have produced” (James, 2001). The writers of this IQP deem many of the categories these animals fall under as acceptable and beneficial to humans. However, it is important to set rules and regulations to ensure that these animals are created using proper techniques and to ensure that they do not suffer in any way. It is our opinion that transgenic animals will have a bright future in science as well as society. 6 PROJECT OBJECTIVE The objective of this project was to explore the new technology of transgenic animals, and investigate its effects on science and society. In order to reach this goal, we first needed to form a strong background on the topic. So we began by researching what a transgenic animal was and how they were created. After building a solid foundation of understanding, we studied the different categories of transgenic animals as well as the contributions and uses of each. In turn, our investigation moved towards the many ethical and legal debates that surround these animals. This project allowed us to understand how scientific breakthroughs can affect much in our daily lives and have so many different views. 7 CHAPTER 1: WHAT IS A TRANSGENIC ANIMAL? Nicholas Maloney and Sara Munro The term transgenic animal refers to an animal in which there has been a deliberate modification of the genome, usually to insert a foreign gene. In biology, the genome of an organism represents an entire set of chromosomes; for example, one of the two sets that a diploid individual carries in every somatic cell. Foreign DNA is introduced into the animal, using recombinant DNA technology, and then must be transmitted through the germ line so that every cell, including germ cells, of the adult animal contain the same modified genetic material. Recombinant DNA technology is a body of techniques for cutting apart and splicing together different pieces of DNA. When segments of foreign DNA are transferred into another cell or organism, the protein that gene encodes may be produced along with substances encoded by the native genetic material of the cell or organism. Thus, these animals become "factories" for the production of the protein encoded by the inserted DNA. Transgenic History Before the development of molecular genetics, the only way of studying the regulation and function of mammalian genes was through the observation of inherited characteristics or spontaneous mutations. Long before Mendel and any molecular genetic knowledge, selective breeding was a common practice among farmers for the enhancement of chosen traits, i.e., increased milk production. The first chimeric mice were produced during the 1970s (Brinster, 1990). A chimera is an organism that contains a mixture of genetically different cells (i.e. some transgenic, some 8 not). The cells of two different embryos of different strains of mice were combined together at an early stage of development (the eight cell stage) to form a single embryo that later developed into a chimeric adult. The adult was chimeric because it exhibited characteristics of each strain of the two original embryos. The combined contributions of developmental biology and genetic engineering permitted a quick development of the techniques used for the creation of transgenic animals. DNA microinjection was the first transgenic technique to prove successful in mammals.
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